I'm not sure how I feel about UBI. A nationwide welfare state isn't something I particularly agree with, but with the number of people increasing and the number of jobs going to decrease due to automation, computing, machines, AI, etc., there needs to be another option for people to obtain money. There are, however, two arguments I've heard made for it which I did like.

Firstly, it stops people "gaming" the system. Everybody gets the same income, regardless of age, disabilities, number of children, and so forth. There are people who know how to squeeze every last drop out of the welfare system, even for things they aren't entitled to. They know the right things to say to get a disability check for a disability that can't be medically disproven. UBI essentially stops this - there is nothing to game. Everyone gets the same.

Secondly, it is cheaper to administer than the current welfare system. The welfare system costs billions just to administer, with huge amounts of bureaucracy and all the means testing, verifications, calculations, investigations, paperwork, refunds, claims, and so forth. UBI eliminates all this as well.